# Airworthiness Directives; General Electric Company Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2012-09-21 · Effective 2012-09-21 · 77 FR 58471
## Document
- **Document number:** 2012-23443
- **Category:** airworthiness
- **Manufacturer:** General Electric Company Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 58471
- **Publication date:** 2012-09-21
- **Effective date:** 2012-09-21
- **FAA docket:** Docket No. FAA-2012-1017
## Abstract

We are adopting a new airworthiness directive (AD) for General Electric Company GEnx-1B54, GEnx-1B58, GEnx-1B64, GEnx-1B67, GEnx-1B70, GEnx-1B54/P1, GEnx-1B58/P1, GEnx-1B64/P1, GEnx-1B67/P1, GEnx-1B70/P1, GEnx-1B70/72/P1, GEnx-1B70/75/P1, GEnx-1B74/75/P1, GEnx-1B75/P1, GEnx- 2B67, and GEnx-2B67B turbofan engines. This AD requires initial and repetitive ultrasonic inspections (UI) of certain part number (P/N) fan mid shafts (FMS) for cracks. This AD was prompted by a report of an FMS failure and a report of a crack found in another FMS. We are issuing this AD to prevent failure of the FMS resulting in one or more engine failure(s) and possible loss of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/09/21/2012-23443/airworthiness-directives-general-electric-company-turbofan-engines)
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